1999

6.8

1984

6.2

1985

7.7

1999

7.1

2003

7.1

2006

6.6

2001

6.9

2004

6.3

1975

4.0

2014

4.7

2001

5.9

1915

4.5

1987

7.1

2003

7.2

1970

3.9

2003

8.2

1994

5.8

2016

6.0

2007

5.6

2005

7.2