1993

6.9

2006

6.6

2014

8.5

1982

6.4

1977

6.7

1972

7.9

7.8

2017

7.2

1990

6.8

2006

7.0

1970

7.2

1970

7.5

1961

8.1

2001

4.3

2003

5.8

1992

6.6

2014

5.7

2003

6.2

2020

6.0

1984

6.7