Year	Number
2008-01-01	2.38661029298242
2009-01-01	2.80112152229221
2010-01-01	5.69486455363078
2011-01-01	6.52652339674480
2012-01-01	7.63382327466641
2013-01-01	7.71854573610291
2014-01-01	6.26811472957781
2015-01-01	6.55303145542304