Year	Number
1996	30.5
1998	34.3283576965332
2000	30.8457717895508
2002	24.3781089782715
2003	21.3930339813232
2004	19.230770111084
2005	17.3076915740967
2006	9.13461494445801
2007	9.61538505554199
2008	9.61538505554199
2009	9.00473976135254
2010	8.53080558776855
2011	8.92018795013428
2012	8.92018795013428
2013	8.92018795013428
2014	9.35960578918457
2015	12.8078813552856
2016	17.2413787841797
2017	18.2266006469727
2018	17.9611644744873
2019	15.9420289993286
2020	14.4927539825439
2021	14.4927539825439
2022	14.4927539825439