Year	Number
1996	13.02
1997	20.66
1998	26.12
1999	21.68
2000	22.54
2001	32.12
2002	23.8
2003	26.25
2004	32.25
2005	38.87
2006	45.06
2007	41.63
2008	48.7
2009	57.37
2010	45.82
2011	74.34
2012	63.02
2013	69.25
2014	86.2
2015	105.22
2016	109.2
2017	130.18
2018	146.92
2019	147.89
2020	173.37