Year	Number
1996	4.94
1997	6.79
1998	8.79
1999	10.18
2000	12.15
2001	13.24
2002	24.24
2003	23.91
2004	36.55
2005	35.52
2006	44.33
2007	51.31
2008	50.51
2009	63.69
2010	55.85
2011	70.69
2012	77.26
2013	85.19
2014	93.43
2015	111.19
2016	124.23
2017	123.88
2018	143.87
2019	140.82
2020	166.15