1970

7.3

2011

5.7

2022

4.5

1963

7.7

2015

7.6

2007

6.7

2006

5.5

2004

5.9

1999

6.8

2000

5.2

1997

5.4

2009

5.6

2004

7.1

2011

7.2

2007

7.0

2015

6.6

2004

6.6

1993

7.5

1996

8.0

1896

7.1