Regional totals	Periodo	Total
National Total	2023	22,51
National Total	2022	22,95
National Total	2021	23,34
National Total	2020	23,78
National Total	2019	24,14
National Total	2018	24,39
National Total	2017	24,5
National Total	2016	24,58
National Total	2015	24,57
National Total	2014	24,44
National Total	2013	24,27
National Total	2012	24,06
National Total	2011	23,8
National Total	2010	23,5
National Total	2009	23,24
National Total	2008	22,98
National Total	2007	22,9
National Total	2006	22,84
National Total	2005	22,79
National Total	2004	22,95
National Total	2003	23,01
National Total	2002	23,15
National Total	2001	23,37
National Total	2000	23,72
National Total	1999	24,2
National Total	1998	24,87
National Total	1997	25,64
National Total	1996	26,58
National Total	1995	27,62
National Total	1994	28,83
National Total	1993	30,02
National Total	1992	31,32
National Total	1991	32,66
National Total	1990	34,06
National Total	1989	35,37
National Total	1988	36,68
National Total	1987	37,91
National Total	1986	39,11
National Total	1985	40,24
National Total	1984	41,4
National Total	1983	42,63
National Total	1982	43,85
National Total	1981	44,9
National Total	1980	45,96
National Total	1979	46,75
National Total	1978	47,26
National Total	1977	47,57
National Total	1976	47,88
National Total	1975	48,07