Regional totals	Periodo	Total
National Total	2023	30,91
National Total	2022	30,68
National Total	2021	30,15
National Total	2020	29,92
National Total	2019	29,7
National Total	2018	29,41
National Total	2017	29
National Total	2016	28,59
National Total	2015	28,18
National Total	2014	27,53
National Total	2013	26,67
National Total	2012	26,06
National Total	2011	25,55
National Total	2010	24,94
National Total	2009	24,46
National Total	2008	24,19
National Total	2007	24,36
National Total	2006	24,52
National Total	2005	24,37
National Total	2004	24,82
National Total	2003	25,12
National Total	2002	25,24
National Total	2001	24,89
National Total	2000	24,51
National Total	1999	24,17
National Total	1998	23,74
National Total	1997	23,28
National Total	1996	22,91
National Total	1995	22,48
National Total	1994	22,13
National Total	1993	21,78
National Total	1992	21,49
National Total	1991	21,16
National Total	1990	20,76
National Total	1989	20,34
National Total	1988	19,93
National Total	1987	19,47
National Total	1986	19,11
National Total	1985	18,81
National Total	1984	18,69
National Total	1983	18,57
National Total	1982	18,46
National Total	1981	18,34
National Total	1980	18,14
National Total	1979	17,89
National Total	1978	17,65
National Total	1977	17,36
National Total	1976	17,15
National Total	1975	16,82