2003

8.0

1992

8.1

1999

6.8

2000

6.3

1988

7.5

2013

6.8

1989

7.9

1980

8.2

2003

6.5

2007

7.6

2008

7.3

2011

6.1

1981

6.2

2009

5.6

2024

6.7

2012

6.3

2015

5.1

1953

5.4

2009

4.1

1980

7.9