1999

8.4

1981

8.0

1991

7.9

2010

6.8

2014

7.3

1982

7.3

1987

5.5

2014

7.1

2015

6.5

1995

6.4

2006

7.7

2015

6.6

2003

9.1

2019

7.1

1967

7.4

2014

8.0

2018

7.5

2018

7.8

2010

7.7

2005

7.5