Year	Number
1996	31.9148941040039
1998	30.319149017334
2000	32.8042335510254
2002	19.0476188659668
2003	20.1005020141602
2004	18.9320392608643
2005	21.3592224121094
2006	12.5603866577148
2007	10.1449279785156
2008	10.5769233703613
2009	9.00473976135254
2010	7.10900497436523
2011	9.95260620117188
2012	7.10900497436523
2013	5.21327018737793
2014	4.2857141494751
2015	7.61904764175415
2016	9.0476188659668
2017	8.5714282989502
2018	6.60377359390259
2019	5.18867921829224
2020	4.71698093414307
2021	6.13207530975342
2022	8.01886749267578