1971

3.2

2005

5.9

2000

5.8

1989

7.1

2014

0.0

1987

7.7

1963

7.6

2002

6.2

1975

4.4

10.0

2002

6.1

1989

7.3

1973

7.9

2008

6.9

1990

7.4

1965

6.9

1998

6.5

2008

6.7

2018

0.0

1985

7.2