1984

7.1

2016

6.1

1993

6.6

2001

5.8

2010

7.7

2003

5.3

1989

7.0

1985

4.3

1967

6.1

1988

6.5

2005

7.7

2020

7.2

1966

6.1

2001

6.9

2000

7.4

1969

7.6

1990

6.1

1959

6.1

1980

5.9

2011

6.6