1966

5.0

1985

6.5

1964

7.0

1968

6.9

1967

6.5

2019

6.5

1998

5.1

1994

6.7

2006

6.1

1996

5.9

1959

7.7

1990

7.2

1987

5.9

1989

5.3

2020

7.1

1986

6.8

1986

6.8

1993

7.9

1988

7.8

2008

6.9