Year Percent 1990 3.54 1991 2.5 1992 3.41 1993 2.74 1994 2.15 1995 2.61 1996 2.52 1997 3.17 1998 2.71 1999 1.92 2000 2.26 2001 1.11 2002 2.36 2003 2.1 2004 1.1 2005 0.98 2006 0.7 2007 0.64 2008 0.98 2009 6.66 2010 5.35 2011 5.37 2012 5.5 2013 6.54 2014 6.39 2015 4.34 2016 2.51 2017 2.943 2018 3.376 2019 3.809 2020 4.242 2021 4.675 2022 5.108 2023 5.541 2024 5.975 2025 6.408 2026 6.841 2027 7.274 2028 7.707 2029 8.14 2030 8.573