Year Percent 1990 7.09 1991 5.94 1992 6.3 1993 6.26 1994 5.84 1995 5.58 1996 6.06 1997 5.64 1998 5.69 1999 4.82 2000 4.34 2001 5.8 2002 7.41 2003 5.52 2004 8.03 2005 7.76 2006 8.6 2007 8.65 2008 9.08 2009 10.46 2010 9.36 2011 8.91 2012 10.8 2013 11.28 2014 12.66 2015 11.44 2016 11.44 2017 11.66 2018 11.88 2019 12.1 2020 12.32 2021 12.541 2022 12.761 2023 12.981 2024 13.201 2025 13.421 2026 13.641 2027 13.861 2028 14.081 2029 14.302 2030 14.522