Year	Number
1974	12.429453251572438
1975	10.957954003423222
1976	3.998304110486081
1977	5.696678502064583
1978	5.5342450292977095
1979	5.232837327287073
1980	7.775235969299973
1981	17.846137718642627
1982	12.488538514627463
1983	5.64699485316751
1984	9.785098302282263
1985	12.254185635144546
1986	10.113399416698808
1987	5.770732451424703
1988	5.304601091853189
1989	12.375083613993553
1990	10.753692383251416
1991	5.682572757629228
1992	4.254293745901894
1993	3.5524281410449623
1994	3.0794870643947614
1995	4.602875562048144
1996	6.367539324865993
1997	7.768343589220944
1998	6.773632232558232
1999	8.747608044107357
2000	10.757831586011338
2001	16.651533024843083
2002	13.584652837824644
2003	10.08260991232597
2004	9.219951472403407
2005	11.662373544041634
2006	9.346940167708153
2007	7.58510928168221
2008	8.105049057299558
2009	5.438271664954238
2010	6.060017368727071
2011	8.384142635690218
2012	6.348971909017497
2013	5.0918185414577914
2014	4.906056872954564
2015	4.5786924404266385
2016	4.515932841465623
2017	4.9059438331382434
2018	5.501726623605948
2019	5.894182217803758
2020	5.003782841426973
2021	5.106947106749911
2022	7.378765472749992
2023	10.248894272651585