Year	Number
1996	4.78723382949829
1998	7.44680833816528
2000	3.70370364189148
2002	15.8730154037476
2003	5.52763795852661
2004	3.88349509239197
2005	5.33980560302734
2006	12.5603866577148
2007	11.1111106872559
2008	13.4615383148193
2009	9.95260620117188
2010	10.4265403747559
2011	9.47867298126221
2012	13.7440757751465
2013	14.6919431686401
2014	9.0476188659668
2015	9.0476188659668
2016	10.4761905670166
2017	13.8095235824585
2018	16.5094337463379
2019	16.0377349853516
2020	13.2075471878052
2021	13.2075471878052
2022	10.8490562438965