Year	Number
1996	14.5
1998	11.9402980804443
2000	11.9402980804443
2002	9.45273590087891
2003	9.95024871826172
2004	18.269229888916
2005	10.5769233703613
2006	6.73076915740967
2007	8.17307662963867
2008	7.692307472229
2009	6.16113758087158
2010	6.63507127761841
2011	4.22535228729248
2012	3.75586843490601
2013	3.75586843490601
2014	4.43349742889404
2015	4.92610836029053
2016	7.88177347183228
2017	7.88177347183228
2018	8.25242710113525
2019	7.72946882247925
2020	11.1111106872559
2021	12.5603866577148
2022	14.0096616744995