1968

6.6

1989

3.5

2019

8.0

1981

4.1

1951

6.7

1979

6.6

1978

6.1

1998

0.0

1994

1.0

2002

5.0

1992

8.0

1979

6.9

1988

7.3

2011

2.7

2003

4.0

2005

3.3

1995

7.3

2017

0.0

2016

2.0

2010

7.1