Year	Number
2009	1.24529051780701
2010	1.28247225284576
2011	1.2762987613678
2012	1.29053568840027
2013	1.27861511707306
2014	1.27684950828552
2015	1.27396094799042
2016	1.27936410903931
2017	1.29554915428162
2018	1.28269290924072
2019	1.26255750656128
2020	1.28214299678802
2021	1.27742886543274
2022	1.26603055000305