1954

7.9

1995

6.5

1995

8.0

1972

8.7

1959

8.1

1974

8.6

1990

7.4

1990

8.5

1983

8.2

1993

7.5

2009

6.5

2020

6.7

2008

5.5

2006

5.9

1969

7.0

2008

4.8

2009

5.3

2009

6.6

2014

4.4

1987

6.2