Year	Number of
1990	29430.88
1991	30543.58
1992	31754.15
1993	33042.12
1994	34410.7
1995	35892.88
1996	36721.2
1997	37567.58
1998	38424.03
1999	39325.56
2000	40227.03
2001	40687.97
2002	41148.77
2003	41616.38
2004	42128.11
2005	42701.92
2006	43181.94
2007	43652.35
2008	44117.02
2009	44567.45
2010	45055.97
2011	45521.76
2012	45966.04
2013	46366.99
2014	46794.37
2015	47323.47
2016	47870.56