1966

5.7

1969

5.6

1965

6.3

2005

6.4

1972

4.9

2008

6.6

2004

6.1

2004

4.8

1968

6.4

1976

7.4

1975

4.3

1964

6.2

1965

6.1

1966

6.1

1970

7.5

1975

6.3

2018

6.8

2014

6.5

1990

6.5

1997

6.0