2001

7.6

2002

8.3

2005

6.8

1977

6.3

1960

7.6

1987

7.5

2007

8.5

2007

7.5

2012

8.1

1966

7.3

1994

8.0

2010

7.2

2015

6.9

2016

7.3

2008

7.6

1966

8.0

1997

8.1

2014

7.5

2013

7.7

2019

7.6