Regional totals Periodo Total National Total 2023 6,61 National Total 2022 6,88 National Total 2021 7,1 National Total 2020 7,19 National Total 2019 7,62 National Total 2018 7,94 National Total 2017 8,41 National Total 2016 8,8 National Total 2015 9,02 National Total 2014 9,18 National Total 2013 9,11 National Total 2012 9,7 National Total 2011 10,07 National Total 2010 10,42 National Total 2009 10,65 National Total 2008 11,28 National Total 2007 10,86 National Total 2006 10,85 National Total 2005 10,65 National Total 2004 10,57 National Total 2003 10,44 National Total 2002 10,08 National Total 2001 9,94 National Total 2000 9,78 National Total 1999 9,39 National Total 1998 9,06 National Total 1997 9,2 National Total 1996 9,07 National Total 1995 9,15 National Total 1994 9,35 National Total 1993 9,8 National Total 1992 10,13 National Total 1991 10,16 National Total 1990 10,32 National Total 1989 10,51 National Total 1988 10,79 National Total 1987 11,02 National Total 1986 11,36 National Total 1985 11,85 National Total 1984 12,34 National Total 1983 12,71 National Total 1982 13,57 National Total 1981 14,1 National Total 1980 15,22 National Total 1979 16,17 National Total 1978 17,25 National Total 1977 17,96 National Total 1976 18,73 National Total 1975 18,7