1990

6.2

1968

6.0

1997

6.8

1999

7.0

2000

5.3

2005

6.8

1991

5.7

2008

1.5

2019

4.2

2003

5.8

2005

7.2

2006

7.6

2004

5.9

1983

5.7

1930

0.0

1983

7.3

2015

7.5

1995

4.4

2019

0.0

2016

6.5