Year	Number
2000	28
2001	24
2002	22
2003	22
2004	21
2005	21
2006	17
2007	17
2008	16
2009	16
2010	16
2011	18
2012	18
2013	19
2014	21
2015	23
2016	21
2017	20
2018	18
2019	18
2020	18