Year	Number of
1990	8433.85
1991	8615.79
1992	8838.33
1993	9229.53
1994	9514.12
1995	9872.41
1996	10278.02
1997	10669.58
1998	11146.01
1999	11609.23
2000	11996.36
2001	12282.37
2002	12527.02
2003	12833.97
2004	13084.23
2005	13367.01
2006	13712.18
2007	13867.46
2008	13961.75
2009	14086.25
2010	14255.75
2011	14631.22
2012	14871.79
2013	15219.07
2014	15550.34
2015	15983.31
2016	16294