Year	Number
1996	1.90521681308746
1998	1.99794685840607
2000	1.80154538154602
2002	1.88874363899231
2003	1.87576138973236
2004	1.84006547927856
2005	1.87544226646423
2006	1.79364252090454
2007	1.72651934623718
2008	1.74589586257935
2009	1.74621033668518
2010	1.76642882823944
2011	1.74194991588593
2012	1.81763017177582
2013	1.79794359207153
2014	1.8124965429306
2015	1.77612352371216
2016	1.78145051002502
2017	1.79661786556244
2018	1.89832532405853
2019	1.86536622047424
2020	1.82571387290955
2021	1.78317177295685
2022	1.81837582588196