Year	Number
1996	13.5
1998	13.4328355789185
2000	8.95522403717041
2002	10.945273399353
2003	9.95024871826172
2004	10.0961542129517
2005	13.4615383148193
2006	20.6730766296387
2007	14.4230766296387
2008	11.5384616851807
2009	13.2701425552368
2010	13.7440757751465
2011	23.0046939849854
2012	24.8826293945313
2013	26.7605628967285
2014	27.5862064361572
2015	28.5714282989502
2016	28.5714282989502
2017	28.5714282989502
2018	30.5825233459473
2019	28.019323348999
2020	26.0869560241699
2021	25.6038646697998
2022	22.7053146362305