2006

5.1

2001

6.8

1977

7.4

2000

7.1

2002

6.3

1995

7.3

1988

5.8

1995

7.3

1996

6.7

2013

6.9

2007

6.9

2016

7.3

2002

6.1

2017

6.7

2003

6.6

2001

6.9

2017

6.3

2018

7.6

2013

8.2

1934

6.6