2000: | 6.7 | 2008: | 4.9 | 2016: | 3.1 | ||
2001: | 6.4 | 2009: | 4.3 | 2017: | 3 | ||
2002: | 6 | 2010: | 4.2 | 2018: | 3 | ||
2003: | 5.9 | 2011: | 3.9 | 2019: | 3 | ||
2004: | 5.7 | 2012: | 3.7 | 2020: | 2 | ||
2005: | 5.5 | 2013: | 3.3 | 2021: | 3 | ||
2006: | 5.3 | 2014: | 3.2 | ||||
2007: | 5.1 | 2015: | 3.3 |