1996

6.9

1995

8.4

2023

8.1

2012

8.2

2009

7.6

2023

7.0

2014

6.5

2000

7.4

1991

8.3

2012

7.4

2012

7.2

2012

6.6

2015

7.8

1984

7.7

2011

8.3

1972

8.7

2007

7.8

2001

7.9

2007

8.1

1979

8.2