Year	Number
1996	1.42448508739471
1998	1.41288626194
2000	1.41334688663483
2002	1.42574501037598
2003	1.45393228530884
2004	1.69253361225128
2005	1.58643817901611
2006	1.51800584793091
2007	1.50381481647491
2008	1.51682984828949
2009	1.55331099033356
2010	1.58491122722626
2011	1.58480751514435
2012	1.64012205600739
2013	1.628098487854
2014	1.55951905250549
2015	1.55852127075195
2016	1.53184378147125
2017	1.55687963962555
2018	1.59192168712616
2019	1.49498355388641
2020	1.53520882129669
2021	1.54160118103027
2022	1.61555957794189