1975

6.3

1989

6.1

1976

6.2

1990

4.4

1989

5.5

1995

5.6

2013

6.6

1988

5.5

2012

5.4

2011

7.5

1975

5.8

1959

6.1

2006

6.8

2024

6.1

1972

7.2

1993

6.5

1964

5.0

1999

6.8

1998

6.1