Year	Number
1996	1.73216354846954
1998	1.79937922954559
2000	1.7510586977005
2002	1.91515922546387
2003	1.96386861801147
2004	2.02662444114685
2005	1.91242349147797
2006	1.90487694740295
2007	2.00334525108337
2008	1.8287581205368
2009	1.69403409957886
2010	1.59612202644348
2011	1.47028934955597
2012	1.42725443840027
2013	1.53724098205566
2014	1.46674907207489
2015	1.47238004207611
2016	1.49696803092957
2017	1.50046288967133
2018	1.56836605072021
2019	1.521409034729
2020	1.47778916358948
2021	1.24299263954163
2022	1.25861942768097