Year	Number
1996	1.11332213878632
1998	0.98031097650528
2000	1.00703871250153
2002	1.02382504940033
2003	1.03586626052856
2004	0.786521434783936
2005	0.949673891067505
2006	1.06540775299072
2007	1.05853140354156
2008	1.08604216575623
2009	1.07438993453979
2010	1.05089402198792
2011	0.99717915058136
2012	0.977706372737885
2013	0.996572315692902
2014	1.11096739768982
2015	1.13475322723389
2016	1.1475967168808
2017	1.14614140987396
2018	1.12343680858612
2019	1.14696323871613
2020	1.12976503372192
2021	1.11345756053925
2022	1.13089883327484