Year	Number
1996	0
1998	1.49253726005554
2000	1.49253726005554
2002	2.98507452011108
2003	5.97014904022217
2004	5.28846168518066
2005	8.17307662963867
2006	8.17307662963867
2007	8.65384578704834
2008	7.692307472229
2009	7.5829381942749
2010	7.10900497436523
2011	7.0422534942627
2012	7.0422534942627
2013	9.38967132568359
2014	10.837438583374
2015	10.3448276519775
2016	11.3300495147705
2017	12.3152713775635
2018	12.1359224319458
2019	13.5265703201294
2020	13.5265703201294
2021	17.8743953704834
2022	17.8743953704834