Year	Number
1992	3.2685274258603196
1993	3.7166583456580433
1994	2.8587583559126175
1995	2.7316726415446055
1996	2.43127412700835
1997	2.3440508822307593
1998	2.308779234217843
1999	2.7283506517179643
2000	2.7636638323259493
2001	2.185459103207456
2002	2.252466560156669
2003	2.269519242730531
2004	2.272135825200077
2005	2.0802632917987225
2006	2.300623845658513
2007	2.041083902019155
2008	2.355155849217566
2009	3.7732246428157943
2010	1.9793872314660301
2011	0.11624553483894194
2012	0.16636566216134735
2013	0.16587768554551446
2014	0.22663055179992453
2015	0.26966900549495687
2016	0.21648578165460722
2017	0.19350135260937387
2018	0.37400920096514534
2019	0.7099645288725601
2020	0.9939961851249054
2021	0.8660248050591319
2022	0.7451871341559189
2023	0.8683771197438337