Year	Number
2000	30
2001	29
2002	27
2003	27
2004	23
2005	22
2006	21
2007	21
2008	21
2009	20
2010	20
2011	18
2012	18
2013	17
2014	17
2015	14
2016	13
2017	13
2018	12
2019	12
2020	14