Year	Number
1960	650
1961	682
1962	724
1963	771
1964	816
1965	866
1966	924
1967	986
1968	1056
1969	1136
1970	1198
1971	1243
1972	1292
1973	1337
1974	1380
1975	1421
1976	1461
1977	1498
1978	1531
1979	1553
1980	1572
1981	1587
1982	1593
1983	1592
1984	1585
1985	1570
1986	1580
1987	1633
1988	1701
1989	1769
1990	1842
1991	1922
1992	2007
1993	2094
1994	2187
1995	2288
1996	2394
1997	2518
1998	2656
1999	2793
2000	2922
2001	3042
2002	3157
2003	3264
2004	3390
2005	3655
2006	4110
2007	4641
2008	5159
2009	5517
2010	5798
2011	6388
2012	7235
2013	7970
2014	8071
2015	8271
2016	9529
2017	10819
2018	11583
2019	12409
2020	13135
2021	13969
2022	15063
2023	16077