1984

7.2

2007

6.9

1992

1.0

1973

5.2

2003

5.0

1957

5.5

1977

3.8

1980

6.4

2001

3.5

2002

3.7

1999

3.0

1970

3.8

1989

3.7

1996

3.7

1995

2.0

1995

1.2

2014

3.2

1971

5.8

1993

3.3

2015

5.1