1999

5.7

1984

7.5

1998

8.1

2000

7.8

2017

6.3

1999

4.5

2005

2.8

2008

5.8

2006

6.7

1985

6.5

1984

6.6

1973

6.9

2004

6.7

1959

7.2

1995

5.8

2011

6.0

2014

3.8

1985

6.6

1984

6.5

1987

6.9