Year	Number
1960	9308
1961	9408
1962	9524
1963	9690
1964	9926
1965	10217
1966	10579
1967	11010
1968	11441
1969	11835
1970	12169
1971	12448
1972	12678
1973	12869
1974	13076
1975	13317
1976	13579
1977	13866
1978	14166
1979	14452
1980	14779
1981	15131
1982	15434
1983	15717
1984	15992
1985	16226
1986	16435
1987	16634
1988	16806
1989	16964
1990	17042
1991	17062
1992	17105
1993	17174
1994	17279
1995	17369
1996	17398
1997	17425
1998	17473
1999	17522
2000	17601
2001	17707
2002	17834
2003	17926
2004	17955
2005	17980
2006	18025
2007	18115
2008	18306
2009	18604
2010	18867
2011	19088
2012	19404
2013	19810
2014	20299
2015	20841
2016	21386
2017	21979
2018	22647
2019	23385
2020	24226
2021	25136
2022	26052
2023	26929