     1974      1975      1976      1977      1978      1979 
11202.157 11144.664 12077.397 14504.190 15903.262 12717.095 
     1980      1981      1982      1983      1984      1985 
11219.440 10974.687  9442.137  9546.094 10477.839 10183.950 
     1986      1987      1988      1989      1990      1991 
10631.596 12296.224 13281.076 13327.433 14492.927 14444.505 
     1992      1993      1994      1995      1996      1997 
16149.101 17463.651 20444.306 20302.165 20065.813 19142.835 
     1998      1999      2000      2001      2002      2003 
21121.472 21985.999 20887.218 19486.637 17609.517 16181.495 
     2004      2005      2006      2007      2008      2009 
16411.924 15802.404 14647.881 12899.019 10236.363  9165.867 
     2010      2011      2012      2013      2014      2015 
 8076.903  7965.700  7673.117  7582.677  7101.090  7109.754 
     2016      2017      2018 
 7929.148  9011.427  9846.140