Year	Number
1997	4157.0361328125
1998	4170.91357421875
1999	4833.38232421875
2000	5163.76904296875
2001	5524.79833984375
2002	5781.38916015625
2003	5170.54931640625
2004	5420.1923828125
2005	5345.5908203125
2006	5309.18359375
2007	5420.248046875
2008	7083.73828125
2009	6352.9296875
2010	5794.24755859375
2011	5415.21826171875
2012	6441.6708984375
2013	6506.388671875
2014	6565.4091796875
2015	6702.8427734375
2016	6461.2314453125