1985

6.4

1994

5.7

1999

6.8

2004

5.7

2000

5.8

1982

6.5

1951

7.7

2007

7.9

2008

7.5

2016

7.1

1995

6.9

2008

6.8

2002

7.4

1999

7.3

1997

6.4

2004

6.9

2002

6.7

1972

7.1

2006

6.5

2002

4.3