1998

6.1

2016

7.2

1992

7.3

1988

5.7

1993

7.1

1996

6.8

1993

7.7

2014

7.8

2009

7.9

2003

7.6

1984

7.3

2017

5.9

2009

7.2

1989

8.3

1992

6.0

1987

6.0

1998

7.1

1993

8.1

2012

6.0

1997

3.5

1990

6.9

1990

3.6