Year	Number
1996	1.06872296333313
1998	1.17716312408447
2000	0.967030942440033
2002	0.883090198040009
2003	0.849399566650391
2004	0.913738012313843
2005	0.883541584014893
2006	0.899841070175171
2007	0.945623457431793
2008	1.00784969329834
2009	1.06890439987183
2010	1.00198233127594
2011	1.04520750045776
2012	1.00906705856323
2013	0.994327008724213
2014	0.999612212181091
2015	0.945320546627045
2016	1.05075812339783
2017	0.991815984249115
2018	1.02418792247772
2019	1.0847235918045
2020	1.03819799423218
2021	1.00272476673126
2022	0.972656548023224