2020

6.7

1977

7.6

2007

5.4

2011

6.9

2011

6.7

2011

6.9

1923

8.5

2009

6.6

1992

5.0

1989

5.8

2005

7.2

1968

6.4

2011

6.2

7.6

2009

6.2

1990

4.4

2010

6.7