1975

5.6

1980

7.5

2002

6.8

2006

6.3

2013

6.7

1990

6.8

1983

5.4

1969

3.0

1986

5.5

1984

1.0

1992

6.0

1997

5.9

2009

6.6

2007

5.6

2005

6.3

1989

4.5

2001

5.1

2019

6.4

1980

5.1

1976

2.0