Year	Number
1960	0
1965	0
1970	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1986	1700
1987	4200
1988	11628
1989	29783
1990	54700
1991	108451
1992	180296
1993	257261
1994	411930
1995	944955
1996	2997645
1997	4337696
1998	6437444
1999	15003708
2000	24265059
2001	29655729
2002	33530997
2003	37219839
2004	38622582
2005	42694115
2006	45695061
2007	48422470
2008	49623339
2009	51052693
2010	51389417
2011	52590507
2012	50665099
2013	50158689
2014	50806251
2015	51067770
2016	51521507
2017	52506928
2018	54161014
2019	55354944
2020	55647705
2021	56805348
2022	59019998