2007

5.0

2005

6.8

1971

7.1

2001

6.0

1997

7.7

1989

6.0

2007

6.4

2005

5.6

1990

6.2

1995

5.1

1998

6.1

2006

7.7

2007

6.5

1999

7.6

2002

7.8

2016

7.3

2016

10.0

2017

6.6

2014

7.5

1934

7.8