Year	Number of
1990	14288.78
1991	14499.19
1992	14787.21
1993	15302.77
1994	15717.63
1995	16271.71
1996	16889.33
1997	17547.2
1998	18186.82
1999	18855.22
2000	19574.49
2001	20012.32
2002	20413.57
2003	20817.85
2004	21212.84
2005	21517.97
2006	21949.86
2007	22191.31
2008	22577.16
2009	22886.15
2010	23196.97
2011	23573.01
2012	23886.98
2013	24204.75
2014	24548.98
2015	24908.64
2016	25191.97