1985

5.2

1990

0.0

2015

9.0

1971

5.6

1961

5.7

2019

6.8

2013

0.0

2005

7.1

2003

6.0

2000

5.5

1997

10.0

1996

8.5

1995

10.0

1985

5.0

1972

5.4

1989

5.8

1997

5.8

1993

5.7

2005

7.1

2008

6.2