Year	Number of
1990	9564.91
1991	10243.58
1992	10972.21
1993	11789.95
1994	12683.7
1995	13677.35
1996	14774
1997	15963.9
1998	17341.6
1999	18827.51
2000	20461.5
2001	21653.67
2002	22937.41
2003	24422.03
2004	25960.61
2005	27576.35
2006	28851.21
2007	30156.21
2008	31594.31
2009	33126.07
2010	34784.3
2011	36682.84
2012	38687.72
2013	40755.73
2014	42921.26
2015	45196.17
2016	47681.26