Year	Number of
1990	31436.14
1991	31498.52
1992	31649.68
1993	31732.79
1994	31703.33
1995	31816.4
1996	31825.25
1997	31575.31
1998	31346.05
1999	31162.38
2000	30906.76
2001	30532.41
2002	30434.03
2003	30426.29
2004	30361.95
2005	30492
2006	30531.11
2007	30609.26
2008	30749.47
2009	30942.12
2010	31033.94
2011	31031.48
2012	31162.14
2013	31327.37
2014	31156.82
2015	31366.19
2016	31692.64