Viikon numerot vuonna 1991
- #MondaySunday
- 1 December 31, 1990 January 6
- 2 January 7 January 13
- 3 January 14 January 20
- 4 January 21 January 27
- 5 January 28 February 3
- 6 February 4 February 10
- 7 February 11 February 17
- 8 February 18 February 24
- 9 February 25 March 3
- 10 March 4 March 10
- 11 March 11 March 17
- 12 March 18 March 24
- 13 March 25 March 31
- 14 April 1 April 7
- 15 April 8 April 14
- 16 April 15 April 21
- 17 April 22 April 28
- 18 April 29 May 5
- 19 May 6 May 12
- 20 May 13 May 19
- 21 May 20 May 26
- 22 May 27 June 2
- 23 June 3 June 9
- 24 June 10 June 16
- 25 June 17 June 23
- 26 June 24 June 30
- 27 July 1 July 7
- 28 July 8 July 14
- 29 July 15 July 21
- 30 July 22 July 28
- 31 July 29 August 4
- 32 August 5 August 11
- 33 August 12 August 18
- 34 August 19 August 25
- 35 August 26 September 1
- 36 September 2 September 8
- 37 September 9 September 15
- 38 September 16 September 22
- 39 September 23 September 29
- 40 September 30 October 6
- 41 October 7 October 13
- 42 October 14 October 20
- 43 October 21 October 27
- 44 October 28 November 3
- 45 November 4 November 10
- 46 November 11 November 17
- 47 November 18 November 24
- 48 November 25 December 1
- 49 December 2 December 8
- 50 December 9 December 15
- 51 December 16 December 22
- 52 December 23 December 29