Year	Number
1985	28.958588021099565
1986	35.770992899106936
1987	16.23575356017518
1988	12.506488944433498
1989	20.484461513686266
1990	4.402920575841149
1991	6.703842373148278
1992	7.2328986675004145
1993	7.3544901879979365
1994	5.757002355548854
1995	2.9466071558622
1996	2.886726009964614
1997	2.670143388114223
1998	2.305370765050377
1999	2.500319028188942
2000	2.5316827110633633
2001	3.1854682411120407
2002	2.793723337357008
2003	2.708583440239757
2004	2.7603388300808764
2005	3.1017263966935555
2006	3.2927826118321724
2007	3.0871513111436117
2008	4.447007393880689
2009	2.9027640788098474
2010	2.780395803588091
2011	3.0448234925363877
2012	2.598127817799568
2013	2.9157843083729356
2014	3.3420013619094977
2015	3.2286063677840753
2016	2.8073466340282414
2017	3.093777222372294
2018	3.422573754966975
2019	3.1752405726240345
2020	3.030146922892042
2021	3.095496097341424
2022	2.8117250938680907
2023	2.7833562127967384