Most often in July, 19 days.
Highest follower count seen that year: 83,257.
January
Jan 2 08:00–12:00 Jan 3 09:00–11:00 Jan 7 09:00–12:00 Jan 9 19:00–22:00 Jan 13 08:00–11:00, 20:00–22:00 Jan 14 19:00–22:00 Jan 16 08:00–11:00 Jan 17 20:00–22:00 Jan 20 10:00–11:00 Jan 21 09:00–11:00, 20:00–21:00 Jan 22 07:00–10:00, 19:00–21:00 Jan 24 08:00–10:00 Jan 25 20:00–23:00 Jan 27 08:00–10:00, 19:00–22:00 Jan 28 08:00–11:00 Jan 30 07:00–11:00, 20:00–21:00 Jan 31 08:00–10:00
February
Feb 4 07:00–10:00 Feb 5 08:00–10:00, 19:00–21:00 Feb 6 09:00–11:00 Feb 7 08:00–12:00 Feb 11 08:00–10:00, 20:00–22:00 Feb 13 08:00–10:00 Feb 14 08:00–10:00 Feb 16 13:00–14:00 Feb 18 19:00–21:00 Feb 19 09:00–12:00 Feb 20 09:00–10:00, 19:00–22:00 Feb 21 08:00–11:00 Feb 25 08:00–10:00, 19:00–22:00 Feb 26 19:00–21:00 Feb 27 09:00–11:00, 19:00–22:00 Feb 28 20:00–22:00
March
Mar 4 08:00–10:00, 19:00–22:00 Mar 5 09:00–11:00 Mar 6 19:00–22:00 Mar 10 10:00–12:00 Mar 11 18:00–22:00 Mar 12 09:00–11:00 Mar 13 19:00–21:00 Mar 18 08:00–11:00, 20:00–21:00 Mar 20 09:00–10:00, 19:00–21:00 Mar 24 08:00–11:00 Mar 25 10:00–13:00, 19:00–22:00 Mar 26 09:00–11:00 Mar 28 09:00–11:00, 21:00–23:00 Mar 30 12:00–14:00 Mar 31 07:00–10:00
April
Apr 1 08:00–10:00 Apr 2 07:00–09:00 Apr 9 08:00–10:00 Apr 10 08:00–10:00 Apr 11 19:00–20:00 Apr 12 14:00–15:00 Apr 14 18:00–21:00 Apr 15 18:00–21:00 Apr 16 07:00–09:00, 18:00–21:00 Apr 22 17:00–20:00 Apr 24 08:00–11:00, 19:00–21:00 Apr 26 16:00–18:00 Apr 28 19:00–20:00 Apr 29 17:00–19:00 Apr 30 08:00–10:00, 20:00–22:00
May
May 1 08:00–10:00 May 7 18:00–21:00 May 8 18:00–20:00 May 9 10:00–12:00 May 12 07:00–10:00 May 13 18:00–21:00 May 14 08:00–10:00 May 15 18:00–20:00 May 16 07:00–10:00 May 20 18:00–19:00 May 21 17:00–20:00 May 22 08:00–11:00, 18:00–20:00 May 27 08:00–10:00, 19:00–21:00 May 28 18:00–20:00 May 29 08:00–10:00 May 30 20:00–22:00 May 31 12:00–15:00
June
Jun 1 18:00–21:00 Jun 4 18:00–21:00 Jun 10 07:00–09:00, 18:00–21:00 Jun 12 08:00–11:00 Jun 16 08:00–10:00 Jun 17 17:00–20:00 Jun 18 07:00–09:00, 18:00–20:00 Jun 20 19:00–21:00 Jun 23 08:00–11:00 Jun 24 19:00–21:00 Jun 25 08:00–10:00 Jun 26 18:00–21:00 Jun 27 08:00–10:00 Jun 29 16:00–19:00 Jun 30 18:00–20:00
July
Jul 1 09:00–12:00 Jul 2 07:00–09:00 Jul 7 08:00–11:00, 18:00–21:00 Jul 9 17:00–20:00 Jul 10 18:00–20:00 Jul 11 07:00–09:00 Jul 13 19:00–22:00 Jul 14 08:00–10:00 Jul 15 07:00–09:00 Jul 17 08:00–10:00, 19:00–21:00 Jul 20 15:00–20:00 Jul 21 17:00–20:00 Jul 22 07:00–09:00, 18:00–20:00 Jul 23 10:00–13:00 Jul 24 12:00–13:00 Jul 25 19:00–21:00 Jul 26 13:00–14:00 Jul 27 21:00–22:00 Jul 28 10:00–13:00, 20:00–21:00
August
Aug 4 20:00–22:00 Aug 5 08:00–10:00 Aug 7 07:00–10:00, 19:00–22:00 Aug 8 18:00–20:00 Aug 9 11:00–13:00 Aug 11 09:00–12:00, 18:00–20:00 Aug 14 10:00–13:00, 19:00–21:00 Aug 15 10:00–12:00, 19:00–22:00 Aug 16 15:00–17:00 Aug 18 10:00–12:00, 18:00–21:00 Aug 20 09:00–11:00, 19:00–21:00 Aug 21 10:00–13:00 Aug 22 10:00–12:00 Aug 25 10:00–12:00 Aug 26 18:00–21:00 Aug 28 18:00–21:00 Aug 29 07:00–10:00 Aug 31 14:00–17:00
September
Sep 1 08:00–12:00, 19:00–21:00 Sep 2 07:00–09:00 Sep 3 08:00–11:00, 18:00–21:00 Sep 4 08:00–11:00 Sep 5 08:00–10:00, 19:00–21:00 Sep 8 08:00–11:00, 19:00–21:00 Sep 9 18:00–21:00 Sep 10 09:00–10:00 Sep 11 08:00–10:00 Sep 14 17:00–21:00 Sep 15 09:00–10:00 Sep 16 09:00–12:00, 19:00–21:00 Sep 18 09:00–11:00, 18:00–21:00 Sep 19 08:00–10:00, 19:00–21:00 Sep 22 09:00–12:00, 18:00–21:00 Sep 24 09:00–11:00, 18:00–21:00 Sep 25 09:00–11:00 Sep 29 09:00–12:00
October
Oct 1 08:00–11:00, 19:00–21:00 Oct 2 09:00–11:00 Oct 3 09:00–11:00 Oct 5 19:00–22:00 Oct 6 09:00–12:00, 19:00–21:00 Oct 7 08:00–11:00 Oct 8 18:00–21:00 Oct 9 09:00–11:00, 18:00–20:00 Oct 17 09:00–11:00 Oct 20 18:00–21:00 Oct 21 19:00–22:00 Oct 22 09:00–11:00 Oct 30 10:00–13:00, 19:00–22:00
November
Nov 3 11:00–14:00 Nov 5 19:00–23:00 Nov 6 21:00–23:00 Nov 10 11:00–14:00 Nov 12 11:00–14:00 Nov 13 11:00–13:00 Nov 17 11:00–14:00, 20:00–22:00 Nov 18 09:00–12:00 Nov 19 10:00–12:00, 19:00–22:00 Nov 20 10:00–12:00, 20:00–22:00 Nov 25 10:00–13:00 Nov 26 21:00–24:00 Nov 30 21:00–23:00
December
Dec 1 10:00–13:00 Dec 2 10:00–13:00 Dec 3 20:00–22:00 Dec 4 20:00–22:00 Dec 8 10:00–14:00 Dec 10 10:00–12:00, 21:00–24:00 Dec 15 10:00–13:00 Dec 16 21:00–24:00 Dec 17 10:00–13:00, 20:00–23:00 Dec 19 22:00–23:00 Dec 21 14:00–16:00 Dec 29 09:00–12:00