Year	Number
1996	8866.52
1997	11237.92
1998	12158.34
1999	14682.76
2000	15875.05
2001	18435.81
2002	20023.41
2003	23666.41
2004	27597.05
2005	31957.31
2006	37079.26
2007	41212.59
2008	43771.58
2009	45865.76
2010	50224.21
2011	53441.41
2012	56031.5
2013	57348.43
2014	60042.57
2015	62506.07
2016	62559.51
2017	63701.87
2018	66408.77
2019	68934.36
2020	72490.44