Year	Number of
1990	940.2
1991	962.98
1992	983.51
1993	1009.21
1994	1043.43
1995	1080.16
1996	1114.09
1997	1136.31
1998	1177.39
1999	1206.88
2000	1238.09
2001	1278.14
2002	1320.47
2003	1353.03
2004	1381.35
2005	1397.89
2006	1409.61
2007	1419.83
2008	1438.97
2009	1474.44
2010	1511.34
2011	1503.28
2012	1518.16
2013	1535.21
2014	1550.22
2015	1542.67
2016	1590.35