Year	Number
1996	6988.380013510611
1997	7170.260654796674
1998	7222.227185426282
1999	7419.6993686096885
2000	7275.184588556936
2001	7615.027172290829
2002	8225.863417554567
2003	8354.21300278402
2004	9153.180420865656
2005	10052.909571781154
2006	11159.333797972542
2007	11908.234651107232
2008	12593.833245977408
2009	14270.580754828576
2010	15537.906843998599
2011	16978.936472414167
2012	17783.560000000005
2013	19023.5
2014	20846.47
2015	22039.090000000007
2016	24327.500000000004
2017	26892.890000000003
2018	29841.47
2019	34005.58000000001
2020	39577.950000000026