| Three-year Moving Average of Birth Rate (Rural/Urban) in Sikkim (1981-1983 to 2011-2013) | |||
| Period | Total | Rural | Urban |
| 1981-83 | 32.4 | 33.5 | 27.7 |
| 1982-84 | 32.6 | 34.1 | 25.6 |
| 1983-85 | 33.1 | 35.1 | 24.0 |
| 1984-86 | 32.3 | 34.3 | 23.1 |
| 1985-87 | 32.8 | 34.5 | 25.3 |
| 1986-88 | 33.1 | 34.7 | 25.5 |
| 1987-89 | 32.8 | 34.4 | 25.5 |
| 1988-90 | 30.4 | 32.1 | 22.5 |
| 1989-91 | 26.6 | 28.3 | 19.0 |
| 1990-92 | 23.6 | 25.5 | 14.5 |
| 1991-93 | 22.8 | 24.3 | 13.3 |
| 1992-94 | 23.5 | 24.6 | 12.7 |
| 1993-95 | 23.8 | 24.0 | 17.4 |
| 1994-96 | 22.3 | 22.6 | 14.2 |
| 1995-97 | 20.8 | 21.0 | 13.5 |
| 1996-98 | 20.2 | 20.5 | 12.5 |
| 1997-99 | 20.8 | 21.0 | 13.7 |
| 1998-00 | 21.4 | 21.7 | 14.3 |
| 1999-01 | 21.7 | 21.9 | 15.4 |
| 2000-02 | 21.8 | 22.0 | 15.0 |
| 2001-03 | 21.8 | 22.1 | 14.5 |
| 2002-04 | 23.8 | 24.1 | 17.5 |
| 2003-05 | 22.4 | 22.7 | 14.3 |
| 2004-06 | 19.5 | 19.8 | 17.9 |
| 2005-07 | 20.2 | 20.5 | 12.5 |
| 2006-08 | 20.8 | 21.0 | 13.7 |
| 2007-09 | 21.4 | 21.7 | 14.3 |
| 2008-10 | 21.7 | 21.9 | 15.4 |
| 2009-11 | 21.8 | 22.0 | 15.0 |
| 2010-12 | 21.8 | 22.1 | 14.5 |
| 2011-13 | 21.1 | 21.4 | 15.0 |
