年份 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | |
东部 | 23.3 | 22.6 | 20.9 | 21.2 | 21.2 | 21.1 | 20.6 | 19.3 | 17.0 | 17.0 | |
中部 | 13.4 | 14.5 | 15.5 | 15.6 | 15.4 | 15.6 | 15.9 | 16.5 | 17.8 | 17.3 | |
西部 | 11.1 | 10.9 | 11.8 | 11.5 | 11.7 | 11.6 | 11.8 | 11.7 | 13.9 | 14.3 | |
年份 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | ||
东部 | 18.1 | 17.4 | 18.8 | 19.4 | 19.2 | 17.5 | 17.7 | 17.4 | 17.7 | ||
中部 | 17.4 | 17.6 | 18.0 | 17.8 | 17.8 | 11.9 | 11.6 | 12.0 | 12.0 | ||
西部 | 13.2 | 13.7 | 12.1 | 11.8 | 11.9 | 20.0 | 20.3 | 20.1 | 19.6 | ||