1999

6.8

1985

7.7

2017

6.1

2010

1.0

2004

6.9

2003

7.2

1990

6.5

1915

4.5

1999

7.1

2018

6.5

2003

8.2

1991

7.1

1994

7.4

2001

5.9

2004

6.3

1995

6.1

1978

4.8

1992

7.5

2000

5.0

2004

4.6