Year	Number
1996	1.07101774215698
1998	1.08732557296753
2000	1.2795318365097
2002	0.955541908740997
2003	0.826347827911377
2004	0.890613675117493
2005	0.93814343214035
2006	0.810453712940216
2007	0.730122447013855
2008	0.774532914161682
2009	0.859580457210541
2010	0.993692219257355
2011	1.10362148284912
2012	1.18402600288391
2013	1.13482463359833
2014	0.956470131874084
2015	0.89498245716095
2016	0.959943354129791
2017	0.976761102676392
2018	0.84756064414978
2019	0.801466107368469
2020	0.830237448215485
2021	0.850836753845215
2022	0.883432567119598