Year	Number
1979	1.5429841211055044
1980	2.8857289041600724
1981	3.945164418151104
1982	5.449562119845457
1983	5.583607594680492
1984	7.098007093057947
1985	6.28914815930215
1986	7.159004991162606
1987	7.77048518785787
1988	10.206407697381234
1989	15.756126869867982
1990	6.886483983384515
1991	4.988091920408086
1992	2.7572298552196313
1993	2.3936961930160447
1994	2.7560679027891357
1995	2.1454753470746617
1996	2.6372937630860176
1997	6.690044614248111
1998	4.714684221628192
1999	2.5534169207412787
2000	5.56151074126573
2001	27.572471138661555
2002	72.98751997859269
2003	29.54047795563243
2004	7.775624360927252
2005	26.884102863593625
2009	1.6796022695363468
2010	3.0385294958119533
2011	4.418334727589812
2012	6.461139881589682
2013	8.18575694140929
2014	12.030611984223299
2015	10.898045594370426
2016	13.846695887480866
2017	21.313758587119
2018	56.484518081867684
2019	23.824877459446505
2020	95.75867596182101
2021	5.0404810485629525
2022	8.628574103315929
2023	34.79013407620661