Year	Number
2009	1.18334448337555
2010	1.21036648750305
2011	1.22138583660126
2012	1.21378171443939
2013	1.23540329933167
2014	1.20334684848785
2015	1.15890049934387
2016	1.13225364685059
2017	1.14874827861786
2018	1.1440976858139
2019	1.11222970485687
2020	1.01000881195068
2021	1.00184488296509
2022	1.02883803844452