1981

5.2

1996

6.5

1997

4.5

2018

5.5

1996

0.0

2015

7.3

1992

5.6

1984

6.9

1996

3.3

2002

6.4

1994

1.0

2005

2.5

2004

6.0

1996

0.0

1994

7.0

1971

6.4

1970

6.2

2001

5.9

2011

5.8

1995

4.3

1992

3.4

1994

9.0