Year	Percent
1995-01-01	41.6932033237422
1996-01-01	41.7126327445410
1997-01-01	40.2887528563027
1998-01-01	41.1123121254028
1999-01-01	39.6152359787486
2000-01-01	39.3076150521766
2001-01-01	39.0866529678268
2002-01-01	36.8321799360697
2003-01-01	34.6204858696860
2004-01-01	34.0711482829263
2005-01-01	33.3235565583816
2006-01-01	33.8295622181612
2007-01-01	33.0201901120926
2008-01-01	33.1757413981974
2009-01-01	32.7385076328389
2010-01-01	32.0356123029206
2011-01-01	31.9108889947076
2012-01-01	31.4691206695589
2013-01-01	30.5973502993798
2014-01-01	30.3394836975869
2015-01-01	29.2812504022117
2016-01-01	28.5916129587892
2017-01-01	28.9541329951337