Year	Number
1996	21.5
1998	18.4079608917236
2000	22.8855724334717
2002	23.8805961608887
2003	28.3582096099854
2004	25
2005	15.865385055542
2006	17.3076915740967
2007	13.942307472229
2008	13.942307472229
2009	13.7440757751465
2010	13.2701425552368
2011	8.92018795013428
2012	7.98122072219849
2013	7.51173686981201
2014	8.3743839263916
2015	9.35960578918457
2016	11.3300495147705
2017	10.837438583374
2018	11.6504850387573
2019	10.6280193328857
2020	10.6280193328857
2021	14.0096616744995
2022	14.0096616744995