Year	Number of
1990	2595.09
1991	2602.24
1992	2578.58
1993	2538.38
1994	2488.93
1995	2489.05
1996	2428.56
1997	2413.73
1998	2429.76
1999	2411.58
2000	2447.61
2001	2455.62
2002	2452.08
2003	2468.58
2004	2444.3
2005	2444.59
2006	2435.04
2007	2463.98
2008	2485.73
2009	2491.85
2010	2486.14
2011	2477.6
2012	2506.21
2013	2540.84
2014	2522.17
2015	2573.8
2016	2638.44