Year	Number
1996	25
1998	31.343282699585
2000	28.3582096099854
2002	20.3980102539063
2003	23.8805961608887
2004	21.634614944458
2005	19.230770111084
2006	19.7115383148193
2007	19.7115383148193
2008	15.384614944458
2009	14.6919431686401
2010	13.7440757751465
2011	13.6150236129761
2012	15.4929580688477
2013	15.023473739624
2014	19.2118225097656
2015	19.2118225097656
2016	13.7931032180786
2017	13.7931032180786
2018	21.8446598052979
2019	22.2222213745117
2020	24.6376819610596
2021	23.1884059906006
2022	25.1207733154297