| Three-year Moving Average of Birth Rate (Rural/Urban) in Tamil Nadu (1971-1973 to 2011-2013) | |||
| Period | Total | Rural | Urban |
| 1971-73 | 31.3 | 33.4 | 26.2 |
| 1972-74 | 30.6 | 32.9 | 25.0 |
| 1973-75 | 30.0 | 32.1 | 25.1 |
| 1974-76 | 30.2 | 32.1 | 25.8 |
| 1975-77 | 30.4 | 31.9 | 26.9 |
| 1976-78 | 29.8 | 30.9 | 27.0 |
| 1977-79 | 28.9 | 29.8 | 26.7 |
| 1978-80 | 28.5 | 29.6 | 26.0 |
| 1979-81 | 28.3 | 29.6 | 25.2 |
| 1980-82 | 27.8 | 29.4 | 24.4 |
| 1981-83 | 27.9 | 29.3 | 24.9 |
| 1982-84 | 27.9 | 28.9 | 26.0 |
| 1983-85 | 26.9 | 27.5 | 25.6 |
| 1984-86 | 25.5 | 25.9 | 24.7 |
| 1985-87 | 24.1 | 24.5 | 23.5 |
| 1986-88 | 23.5 | 23.9 | 22.8 |
| 1987-89 | 23.3 | 23.6 | 22.5 |
| 1988-90 | 22.5 | 22.9 | 21.7 |
| 1989-91 | 21.8 | 22.0 | 21.4 |
| 1990-92 | 21.0 | 21.3 | 20.6 |
| 1991-93 | 20.3 | 20.5 | 20.0 |
| 1992-94 | 19.8 | 20.2 | 19.1 |
| 1993-95 | 19.7 | 20.1 | 18.8 |
| 1994-96 | 19.7 | 20.2 | 18.6 |
| 1995-97 | 19.6 | 20.1 | 18.6 |
| 1996-98 | 23.3 | 23.7 | 22.5 |
| 1997-99 | 22.5 | 22.9 | 21.6 |
| 1998-00 | 21.8 | 22.0 | 21.4 |
| 1999-01 | 21.0 | 21.2 | 20.6 |
| 2000-02 | 20.3 | 20.5 | 20.0 |
| 2001-03 | 19.8 | 20.2 | 19.1 |
| 2002-04 | 19.7 | 20.1 | 18.8 |
| 2003-05 | 19.7 | 20.2 | 18.6 |
| 2004-06 | 16.6 | 17.1 | 16.0 |
| 2005-07 | 19.2 | 19.7 | 18.3 |
| 2006-08 | 19.2 | 19.6 | 18.2 |
| 2007-09 | 19.3 | 19.8 | 18.1 |
| 2008-10 | 19.2 | 19.8 | 18.0 |
| 2009-11 | 19.0 | 19.5 | 17.8 |
| 2010-12 | 18.6 | 19.2 | 17.5 |
| 2011-13 | 18.0 | 18.6 | 17.0 |
