Year	Number
1996	1.82080864906311
1998	1.83726668357849
2000	1.80873346328735
2002	1.88234078884125
2003	1.92051100730896
2004	1.93052399158478
2005	1.93610906600952
2006	1.98349893093109
2007	1.99517047405243
2008	1.95405626296997
2009	1.91712713241577
2010	1.89844179153442
2011	1.91979134082794
2012	1.87506687641144
2013	1.90229380130768
2014	2.10087656974792
2015	2.01560211181641
2016	1.88353669643402
2017	1.80355656147003
2018	1.77329659461975
2019	1.83364605903625
2020	1.80827939510345
2021	1.89605689048767
2022	1.90030813217163