Year	Number
2004	0.993218183517456
2005	1.37641596794128
2006	1.30346059799194
2007	1.28656852245331
2008	1.3163959980011
2009	1.12155425548553
2010	1.10084736347198
2011	1.28573775291443
2012	1.26388156414032
2013	1.31222629547119
2014	1.16456782817841
2015	1.21023952960968
2016	1.26075851917267
2017	1.31384432315826
2018	1.33727550506592
2019	1.33566856384277
2020	1.37149739265442
2021	1.4315470457077
2022	1.47468435764313