1990: 3.04%
199 1 year: 2.86%
1992: 2.74%
1993: 2.5 1%
1994: 2.5 1%
1995: 2.4 1%
1996: 2.46%
1997: 2.49%
1998: 2.59%
1999: 2.79%
2000: 2.87%
200 1 year: 3. 19%
2002: 3.4 1%
2003: 3.28%
2004: 2.79%
2005: 2.8 1%
2006: 3.0 1%
2007: 3.32%
2008: 3.48%
2009: 3.59%
20 10: 3.66%
20 1 1 year: 3.93%
20 12: 4.28%.
20 13: 4.30%
20 14: 4. 15%