Year	Number
1996	16.0804023742676
1998	9.5
2000	2.98507452011108
2002	1.99004971981049
2003	1.49253726005554
2004	1.44230771064758
2005	0.478468894958496
2006	0.956937789916992
2007	1.43540668487549
2008	1.44230771064758
2009	3.79146909713745
2010	4.26540279388428
2011	2.3474178314209
2012	7.0422534942627
2013	11.7370891571045
2014	20.6730766296387
2015	18.0952377319336
2016	18.0952377319336
2017	18.5714282989502
2018	20
2019	21.9047622680664
2020	20.4761905670166
2021	19.5238094329834
2022	24.5283012390137