Year	Number
1996	17.9347820281982
1998	15.2173910140991
2000	16.3043479919434
2002	14.5945949554443
2003	16.7567558288574
2004	12.4378108978271
2005	15.1960783004761
2006	17.1568622589111
2007	18.4466018676758
2008	18.9320392608643
2009	22.0095691680908
2010	20.5741634368896
2011	22.748815536499
2012	18.4834117889404
2013	20.3791465759277
2014	16.8269233703613
2015	17.1428565979004
2016	21.9047622680664
2017	20
2018	17.619047164917
2019	15.2380952835083
2020	15.2380952835083
2021	20.4761905670166
2022	17.9245281219482