Year	Number of
1990	1640.98
1991	1615.34
1992	1603.35
1993	1567.21
1994	1534.84
1995	1532.86
1996	1544.64
1997	1522.98
1998	1516.68
1999	1502.52
2000	1477.48
2001	1467.27
2002	1470.51
2003	1473.68
2004	1482.47
2005	1493.09
2006	1515.82
2007	1520.38
2008	1519.04
2009	1536.65
2010	1538.98
2011	1518.38
2012	1517.2
2013	1506.72
2014	1483.81
2015	1458.93
2016	1449.76