Most often in January, 24 days.
Highest follower count seen that year: 67,238.
January
Jan 3 06:00–15:00 Jan 5 06:00–16:00 Jan 6 05:00–15:00 Jan 7 06:00–07:00, 09:00–21:00 Jan 8 06:00–07:00, 11:00–16:00, 18:00–21:00 Jan 9 06:00–08:00, 10:00–11:00 Jan 10 05:00–10:00, 12:00–17:00 Jan 13 07:00–08:00, 10:00–16:00, 19:00–20:00 Jan 14 10:00–16:00, 19:00–21:00 Jan 15 06:00–16:00, 18:00–20:00 Jan 16 06:00–07:00, 09:00–20:00 Jan 17 06:00–08:00 Jan 19 06:00–17:00, 19:00–21:00 Jan 20 06:00–10:00, 13:00–20:00 Jan 21 07:00–11:00, 13:00–16:00, 18:00–22:00 Jan 22 06:00–12:00 Jan 24 08:00–16:00 Jan 25 19:00–20:00 Jan 26 08:00–12:00, 18:00–20:00 Jan 27 07:00–09:00, 20:00–22:00 Jan 28 12:00–16:00 Jan 29 09:00–11:00 Jan 30 06:00–07:00, 19:00–20:00 Jan 31 08:00–17:00
February
Feb 2 09:00–11:00, 13:00–18:00 Feb 3 07:00–09:00, 11:00–15:00, 19:00–21:00 Feb 4 10:00–11:00 Feb 5 12:00–16:00 Feb 6 06:00–11:00, 19:00–21:00 Feb 7 10:00–12:00, 14:00–16:00 Feb 9 07:00–16:00, 18:00–21:00 Feb 10 06:00–10:00, 15:00–21:00 Feb 11 08:00–09:00, 12:00–14:00, 18:00–20:00 Feb 12 07:00–10:00, 12:00–13:00, 18:00–21:00 Feb 13 08:00–09:00, 12:00–16:00 Feb 14 06:00–07:00 Feb 16 07:00–08:00, 10:00–15:00 Feb 17 08:00–09:00, 20:00–22:00 Feb 18 08:00–10:00, 12:00–16:00, 18:00–20:00 Feb 19 06:00–07:00, 12:00–16:00, 18:00–20:00 Feb 20 06:00–09:00, 11:00–16:00 Feb 21 08:00–14:00 Feb 23 07:00–17:00, 19:00–20:00 Feb 24 07:00–08:00, 17:00–20:00 Feb 26 06:00–07:00, 10:00–11:00, 13:00–16:00, 19:00–20:00 Feb 27 07:00–16:00, 19:00–21:00 Feb 28 08:00–11:00, 15:00–17:00
March
Mar 2 10:00–11:00, 15:00–16:00 Mar 3 08:00–09:00, 11:00–14:00, 16:00–17:00, 19:00–22:00 Mar 4 09:00–13:00, 15:00–16:00, 20:00–22:00 Mar 5 10:00–14:00, 20:00–21:00 Mar 9 08:00–15:00, 18:00–21:00 Mar 10 08:00–11:00, 14:00–16:00, 19:00–22:00 Mar 11 07:00–09:00, 13:00–16:00, 19:00–22:00 Mar 13 06:00–11:00, 13:00–15:00 Mar 14 08:00–12:00 Mar 16 10:00–14:00 Mar 17 08:00–10:00, 13:00–16:00, 18:00–22:00 Mar 18 07:00–10:00, 13:00–16:00 Mar 19 07:00–12:00, 14:00–16:00 Mar 20 06:00–16:00, 20:00–22:00 Mar 21 06:00–14:00 Mar 23 07:00–13:00, 17:00–21:00 Mar 24 07:00–12:00, 15:00–16:00, 19:00–20:00 Mar 25 06:00–11:00, 14:00–16:00 Mar 26 07:00–16:00 Mar 27 06:00–08:00, 15:00–19:00 Mar 28 06:00–15:00 Mar 30 07:00–16:00 Mar 31 06:00–13:00, 15:00–16:00, 18:00–19:00
April
Apr 1 07:00–12:00, 14:00–16:00, 18:00–21:00 Apr 2 02:00–06:00 Apr 7 06:00–11:00, 13:00–16:00, 19:00–21:00 Apr 8 06:00–08:00, 10:00–15:00, 19:00–21:00 Apr 10 07:00–14:00 Apr 11 07:00–10:00, 12:00–14:00 Apr 13 09:00–11:00, 13:00–16:00 Apr 14 07:00–09:00, 11:00–16:00 Apr 15 07:00–09:00, 12:00–14:00, 19:00–22:00 Apr 16 09:00–10:00, 14:00–16:00 Apr 18 07:00–09:00, 12:00–16:00 Apr 22 08:00–11:00, 13:00–16:00, 19:00–21:00 Apr 23 07:00–10:00, 12:00–15:00 Apr 24 06:00–17:00 Apr 27 06:00–15:00, 18:00–20:00 Apr 28 07:00–16:00 Apr 29 09:00–15:00, 19:00–21:00 Apr 30 07:00–15:00
May
May 1 07:00–08:00 May 2 07:00–08:00, 13:00–14:00 May 11 07:00–12:00, 14:00–16:00, 20:00–21:00 May 12 07:00–15:00, 19:00–22:00 May 13 19:00–22:00 May 14 08:00–11:00, 14:00–16:00 May 15 07:00–10:00 May 18 18:00–22:00 May 19 06:00–16:00 May 25 18:00–22:00 May 26 07:00–10:00, 18:00–22:00 May 27 08:00–10:00, 13:00–14:00 May 28 07:00–16:00, 19:00–22:00 May 29 07:00–12:00 May 30 07:00–14:00
June
Jun 1 07:00–14:00 Jun 3 07:00–13:00, 15:00–16:00 Jun 4 07:00–11:00, 13:00–15:00 Jun 6 07:00–16:00 Jun 9 08:00–16:00 Jun 10 08:00–23:00 Jun 11 08:00–17:00 Jun 12 08:00–09:00, 11:00–16:00 Jun 13 10:00–16:00 Jun 18 08:00–10:00, 19:00–22:00 Jun 19 10:00–16:00 Jun 20 08:00–15:00 Jun 22 07:00–16:00 Jun 23 07:00–14:00 Jun 24 07:00–16:00 Jun 25 07:00–15:00 Jun 26 06:00–14:00 Jun 27 07:00–09:00, 11:00–12:00, 14:00–16:00 Jun 29 07:00–15:00 Jun 30 06:00–09:00, 12:00–16:00
July
Jul 1 19:00–21:00 Jul 2 07:00–15:00, 19:00–21:00 Jul 3 20:00–22:00 Jul 4 07:00–16:00 Jul 6 07:00–16:00 Jul 7 07:00–12:00 Jul 9 07:00–11:00 Jul 13 08:00–16:00 Jul 16 09:00–10:00, 13:00–16:00 Jul 17 07:00–16:00 Jul 18 09:00–11:00 Jul 20 08:00–09:00, 11:00–18:00 Jul 21 09:00–10:00, 12:00–15:00 Jul 22 08:00–15:00 Jul 25 11:00–15:00 Jul 27 07:00–11:00, 12:00–13:00