1989

6.1

1988

6.3

1987

6.6

1994

5.8

1996

5.7

1994

8.0

1992

6.9

2018

6.5

2003

3.0

1986

6.6

2013

5.2

2015

0.0

1983

5.9

2008

6.6

2007

6.5

2005

5.4

1932

7.4

1968

7.2

1987

7.3

1989

7.0