1993

4.8

1976

5.3

1978

4.2

2001

3.5

2002

3.7

1999

3.0

1970

3.8

1989

3.7

1970

5.5

1970

5.0

1974

5.5

1995

2.0

1995

1.2

2014

3.2

1970

5.3

1979

2.0

1977

3.8

2008

4.0

2005

3.6

2013

4.3