Most often in July, 19 days.
Highest follower count seen that year: 75,265.
January
Jan 1 21:00–23:00 Jan 3 21:00–23:00 Jan 4 21:00–23:00 Jan 5 21:00–23:00 Jan 7 10:00–12:00, 20:00–23:00 Jan 9 21:00–23:00 Jan 10 11:00–13:00, 20:00–22:00 Jan 15 10:00–11:00, 20:00–22:00 Jan 16 11:00–12:00 Jan 17 21:00–23:00 Jan 18 10:00–12:00, 21:00–23:00 Jan 19 11:00–12:00, 20:00–22:00 Jan 20 10:00–11:00 Jan 26 09:00–12:00, 21:00–23:00 Jan 27 10:00–12:00, 20:00–23:00 Jan 28 11:00–13:00, 20:00–22:00
February
Feb 9 20:00–21:00 Feb 10 09:00–10:00, 19:00–22:00 Feb 11 10:00–12:00, 20:00–22:00 Feb 12 09:00–11:00, 20:00–22:00 Feb 13 10:00–12:00, 21:00–23:00 Feb 14 10:00–11:00 Feb 19 20:00–22:00 Feb 20 10:00–11:00 Feb 22 09:00–13:00, 20:00–22:00 Feb 23 10:00–12:00 Feb 24 09:00–11:00 Feb 25 10:00–13:00, 22:00–23:00 Feb 26 10:00–12:00, 20:00–22:00 Feb 27 10:00–12:00, 20:00–22:00 Feb 28 20:00–22:00
March
Mar 1 21:00–22:00 Mar 2 20:00–22:00 Mar 3 10:00–12:00, 20:00–22:00 Mar 4 10:00–12:00 Mar 5 10:00–11:00, 20:00–22:00 Mar 6 20:00–22:00 Mar 18 18:00–21:00 Mar 19 18:00–21:00 Mar 21 09:00–12:00, 19:00–22:00 Mar 26 20:00–23:00 Mar 27 10:00–11:00, 19:00–20:00 Mar 30 10:00–11:00, 21:00–22:00 Mar 31 10:00–11:00
April
Apr 1 09:00–10:00 Apr 2 20:00–22:00 Apr 3 08:00–12:00 Apr 4 09:00–10:00, 20:00–22:00 Apr 6 19:00–21:00 Apr 7 09:00–10:00, 20:00–21:00 Apr 8 20:00–22:00
May
May 12 19:00–22:00 May 14 19:00–22:00 May 15 19:00–21:00 May 16 11:00–12:00, 20:00–21:00 May 17 10:00–11:00 May 18 09:00–11:00, 20:00–22:00 May 22 10:00–12:00, 20:00–22:00 May 23 11:00–12:00, 19:00–21:00 May 25 10:00–11:00, 20:00–22:00 May 26 11:00–12:00 May 27 10:00–12:00, 20:00–24:00 May 28 09:00–10:00, 20:00–23:00 May 29 10:00–12:00, 20:00–22:00 May 30 10:00–12:00, 20:00–23:00 May 31 11:00–12:00, 20:00–22:00
June
Jun 7 20:00–21:00 Jun 8 09:00–10:00 Jun 9 09:00–11:00, 20:00–22:00 Jun 10 20:00–23:00 Jun 11 09:00–10:00, 20:00–22:00 Jun 13 20:00–21:00 Jun 14 09:00–10:00, 20:00–22:00 Jun 15 10:00–11:00, 20:00–22:00 Jun 16 20:00–23:00 Jun 17 09:00–10:00, 20:00–22:00 Jun 18 20:00–22:00 Jun 19 20:00–22:00 Jun 20 09:00–10:00 Jun 25 09:00–10:00
July
Jul 2 09:00–11:00 Jul 3 08:00–09:00, 20:00–22:00 Jul 4 09:00–10:00, 20:00–22:00 Jul 5 10:00–11:00 Jul 6 11:00–13:00, 20:00–22:00 Jul 7 10:00–11:00, 20:00–22:00 Jul 8 10:00–11:00 Jul 9 20:00–23:00 Jul 10 10:00–11:00, 20:00–22:00 Jul 11 11:00–12:00, 20:00–21:00 Jul 12 10:00–11:00 Jul 13 11:00–13:00, 21:00–23:00 Jul 14 09:00–11:00, 20:00–23:00 Jul 15 09:00–11:00 Jul 16 10:00–11:00, 21:00–22:00 Jul 17 20:00–21:00 Jul 18 20:00–22:00 Jul 19 10:00–11:00, 20:00–23:00 Jul 20 10:00–12:00
August
Aug 6 10:00–12:00, 19:00–21:00 Aug 8 10:00–12:00, 19:00–21:00 Aug 9 10:00–12:00, 19:00–22:00 Aug 11 09:00–11:00 Aug 12 09:00–11:00, 18:00–21:00 Aug 13 09:00–11:00, 20:00–21:00 Aug 14 09:00–11:00, 20:00–21:00 Aug 15 08:00–10:00 Aug 16 08:00–10:00 Aug 17 10:00–12:00, 20:00–22:00 Aug 25 08:00–10:00, 22:00–23:00 Aug 27 20:00–21:00 Aug 28 10:00–12:00, 20:00–21:00 Aug 29 09:00–10:00, 20:00–22:00 Aug 31 08:00–10:00, 16:00–17:00, 20:00–22:00
September
Sep 1 10:00–12:00 Sep 2 20:00–23:00 Sep 3 10:00–11:00, 21:00–23:00 Sep 4 10:00–11:00 Sep 5 09:00–11:00 Sep 7 11:00–13:00, 20:00–22:00 Sep 8 20:00–22:00 Sep 9 10:00–12:00, 20:00–22:00 Sep 10 20:00–22:00 Sep 11 09:00–11:00, 20:00–22:00 Sep 12 10:00–11:00 Sep 19 09:00–10:00, 20:00–21:00 Sep 20 10:00–12:00, 20:00–22:00 Sep 21 20:00–22:00 Sep 22 09:00–11:00 Sep 23 10:00–11:00, 20:00–22:00 Sep 24 09:00–11:00 Sep 25 10:00–11:00 Sep 27 19:00–20:00
October
Oct 5 20:00–21:00 Oct 6 20:00–22:00 Oct 7 09:00–10:00 Oct 8 09:00–11:00, 20:00–22:00 Oct 9 09:00–10:00 Oct 14 09:00–12:00 Oct 15 09:00–10:00, 21:00–22:00 Oct 16 10:00–11:00 Oct 18 09:00–11:00 Oct 19 10:00–12:00, 20:00–22:00 Oct 20 10:00–13:00, 20:00–22:00 Oct 22 10:00–11:00, 20:00–22:00 Oct 23 21:00–22:00 Oct 24 09:00–10:00 Oct 28 21:00–22:00 Oct 29 10:00–12:00, 20:00–22:00 Oct 30 09:00–10:00 Oct 31 10:00–11:00
November
Nov 1 09:00–10:00, 20:00–22:00 Nov 2 09:00–10:00, 20:00–22:00 Nov 3 08:00–09:00, 20:00–21:00 Nov 9 09:00–10:00 Nov 10 19:00–20:00 Nov 11 09:00–11:00 Nov 12 11:00–12:00, 20:00–22:00 Nov 13 10:00–11:00, 21:00–22:00 Nov 22 11:00–12:00, 19:00–22:00 Nov 24 08:00–10:00, 20:00–21:00 Nov 25 09:00–10:00, 20:00–21:00 Nov 27 09:00–10:00, 20:00–21:00 Nov 28 20:00–22:00 Nov 29 09:00–10:00
December
Dec 12 19:00–22:00 Dec 13 10:00–11:00 Dec 15 20:00–22:00 Dec 16 20:00–22:00 Dec 17 20:00–22:00 Dec 18 11:00–12:00, 21:00–23:00 Dec 20 08:00–10:00, 19:00–21:00 Dec 22 10:00–12:00, 20:00–21:00 Dec 23 09:00–11:00 Dec 24 09:00–11:00, 19:00–21:00 Dec 25 21:00–23:00 Dec 26 09:00–10:00 Dec 27 10:00–11:00, 20:00–22:00 Dec 28 20:00–22:00