1972

6.5

2005

7.2

1987

7.3

1973

6.2

2007

6.7

1964

7.5

2007

7.1

1992

7.3

2003

6.1

1999

6.1

1977

5.2

1990

4.0

2013

5.6

2013

7.4

1988

7.2

2003

6.5

2018

5.8

1998

7.0

1989

6.2

1976

4.3