1984

7.7

1989

8.1

2019

6.8

1993

6.5

1986

7.3

1997

7.5

2014

7.1

1993

5.9

1984

7.0

1990

6.0

2011

7.1

1994

6.8

2008

6.7

2001

5.8

1990

7.4