Year	Number
1996	1.73311007022858
1998	1.91423785686493
2000	2.1970431804657
2002	2.19461417198181
2003	2.22752285003662
2004	2.167231798172
2005	2.30135536193848
2006	2.17291116714478
2007	2.19767022132874
2008	2.32725143432617
2009	2.03152012825012
2010	1.93496966362
2011	1.93282318115234
2012	1.87803149223328
2013	1.90477347373962
2014	1.82383286952972
2015	1.89814746379852
2016	1.90391433238983
2017	1.79447102546692
2018	1.80538582801819
2019	1.67087435722351
2020	1.667649269104
2021	1.760617852211
2022	1.56752812862396