1992

8.2

1974

7.2

1998

7.1

1990

6.9

2015

7.2

1985

7.5

1999

7.4

2006

7.4

2008

8.1

2009

7.1

2014

6.1

1990

7.4

2014

6.4

2000

8.0

2015

7.4

1987

8.4

1984

7.8

2016

6.5

2005

6.8

1989

8.0