2019

7.5

2018

7.0

1991

5.9

2011

7.3

2015

6.9

2015

7.3

2007

6.7

1994

6.6

2006

5.7

2009

5.9

1997

5.8

2000

6.5

2009

5.9

1956

6.3

2013

8.0

2007

7.9

1970

6.8

2013

7.3

2011

6.8

2024

8.0