1997

6.4

1992

6.3

2006

5.9

1982

4.8

1990

6.9

2012

7.6

1994

7.8

1999

8.2

1979

6.7

1990

7.4

2001

7.6

1999

7.9

1979

7.7

1975

0.0

2018

5.4

1990

6.4

1999

4.3

2014

6.1

2000

6.8

2011

4.1

2000

7.0