Year	Number
1996	16
1998	7.96019887924194
2000	9.45273590087891
2002	22.3880596160889
2003	23.8805961608887
2004	23.0769233703613
2005	19.7115383148193
2006	17.3076915740967
2007	17.3076915740967
2008	17.7884616851807
2009	19.9052124023438
2010	13.7440757751465
2011	8.45070457458496
2012	6.1032862663269
2013	5.63380289077759
2014	5.9113302230835
2015	6.89655160903931
2016	5.9113302230835
2017	5.9113302230835
2018	5.82524251937866
2019	5.31400966644287
2020	4.34782600402832
2021	1.93236720561981
2022	4.8309178352356