Year	Number
2000	40.0751200494
2001	38.5750962773
2002	46.1607949413
2003	48.6259687158
2004	54.3146484096
2005	58.1942661532
2006	56.2668188085
2007	53.8567964627
2008	51.4467741169
2009	49.036751771
2010	38.6250178291
2011	38.0687491085
2012	41.7344173442
2013	43.1322207959
2014	39.1527599487
2015	41.5347311368
2016	40.0228212808
2017	41.0783055199
2018	42.7471116816
2019	47.0118385394
2020	50.2638710598