Year	Number
1996	79.05
1997	114.9
1998	99.19
1999	108.1
2000	75.76
2001	81.14
2002	78.97
2003	98.37
2004	106.46
2005	102.07
2006	98.6
2007	119.18
2008	164.66
2009	150.72
2010	156.06
2011	179.43
2012	185.37
2013	158.68
2014	181.06
2015	175.74
2016	172.82
2017	198.18
2018	246.41
2019	235.97
2020	241.01