1951

7.4

1994

8.7

1983

7.9

2019

8.1

1994

8.3

2002

7.2

2002

7.7

2002

8.4

1985

8.3

2018

7.0

2009

7.6

2007

7.3

1979

8.2

2013

8.0

2008

8.5

1972

8.7

2008

8.0

1999

7.6

2012

7.1

2011

8.3