1995

8.0

2005

7.0

1975

7.5

2012

8.9

1998

6.9

2019

0.0

2000

7.1

2004

7.5

1980

6.5

2015

1.5

1959

7.9

2013

8.3

2016

7.1

2003

4.3

2018

6.4

1986

7.0

1988

6.8

1992

0.0

1991

6.2

2013

5.2