Year	Number
1989	48.95451139513618
1990	11.703486027559578
1991	12.776089642552867
1992	8.419780395400567
1993	10.696546518153497
1994	6.153955768266195
1995	4.81531421444861
1996	4.964996779680704
1997	6.253352905715992
1998	7.636184043481597
1999	7.063749389278362
2000	9.228919405778448
2001	9.154878908101312
2002	7.41202452911846
2003	6.400945312274078
2004	7.122424005824611
2005	9.96605389039792
2006	8.161090343772118
2007	5.296052135728864
2008	6.168738893313251
2009	5.317462177612008
2010	5.680976597129132
2011	5.709689909999971
2012	5.222499808163889
2013	5.418626401153794
2014	5.533074171932475
2015	4.45261573387927
2016	4.61592803783358
2017	5.135097153175974
2018	4.794156765837045
2019	5.042053852614253
2020	4.5308456715274685
2021	4.7722193020497095
2022	6.299935139340126
2023	6.825695978503155