Year	Number
1971	3800637.25
1972	3967168
1973	4134314.5
1974	4270498
1975	4338489.5
1976	4452149
1977	4637707.5
1978	4746800
1979	4768002
1980	4763980.5
1981	4811217.5
1982	4838313
1983	4947383.5
1984	5059470
1985	5262886.5
1986	5480455.5
1987	5693264.5
1988	5876315.5
1989	6020127.5
1990	6236688.5
1991	6417097.5
1992	6543491.5
1993	6690109.5
1994	6848996
1995	7049218
1996	7381662
1997	7654222
1998	7982113
1999	8296564
2000	8543095
2001	8556360
2002	9118824
2003	9500984
2004	9672755
2005	10018266
2006	9912246
2007	10393119
2008	10813792
2009	11087130
2010	11361810
2011	11548302
2012	11631492
2013	11586517
2014	11813512
2015	11994207
2016	12413998
2017	12715961
2018	13316618
2019	13929802
2020	14059430
2021	14820690
2022	15142769