1997

6.8

1998

7.2

1992

7.4

2019

6.4

2017

4.5

2003

5.8

2000

6.5

1990

7.4

2001

6.9

2001

6.1

1998

6.7

2000

6.1

1941

6.4

1980

5.0

1967

6.5

1971

4.6

1986

4.4

2018

0.0

2014

5.4

1999

6.4