Year thousand metric tons of CO2 equivalent 1990 595.0075 1991 604.4325 1992 609.1775 1993 590.0875 1994 533.38 1995 546.2525 1996 539.5 1997 559.955 1998 498.405 1999 499.88 2000 510.7925 2001 526.075 2002 510.1125 2003 528.3875 2004 560.9825 2005 591.2925 2006 644.22 2007 681.235 2008 736.46 2009 811.7125 2010 911.0475 2011 992.5525 2012 993.8375 2013 1190.645 2014 1151.07 2015 1143.6475 2016 1306.495 2017 1589.305 2018 1587.48 2019 1344.7525 2020 1237.415