1989

7.3

1990

4.4

1989

6.1

2018

7.1

2007

7.3

1990

6.1

1967

7.3

2010

4.7

2017

7.4

1993

6.6

1988

5.5

1989

5.8

1960

7.7

1977

6.8

1988

6.0

2003

5.9

2005

6.4

1987

4.1

2015

7.2