Year Rate Ratio
2002 2.37 100
2003 2.52 100
2004 2.62 90.14
2005 2.72 81.76
2006 2.78 75.31
2007 2.87 68.29
2008 2.984 65.45
2009 3.124 65.02
2010 3.271 67.79
2011 3.514 67.93
2012 3.654 69.55
2013 3.745 71.08
2014 3.826 74.49
2015 3.889 74.65
2016 3.127 100
2017 3.202 96.53
2018   95.81