1993

5.5

2005

6.9

1990

2.5

2006

7.1

2007

6.1

2014

5.1

1991

5.7

1978

4.9

1997

6.0

1974

4.7

1990

4.4

1970

2.5

1997

2.0

1971

5.7

1998

2.7

1975

2.3

2002

0.0

2006

6.8

1981

6.2

1982

5.9