1988

7.1

2001

5.1

1970

2.0

1975

5.5

2019

6.9

1968

7.6

1976

5.7

1993

7.8

2002

5.6

2009

7.5

2012

4.4

1989

5.0

2004

5.5

1996

2.0

2003

7.8

1989

3.1

2006

7.4

1972

5.7

1985

6.0

1999

4.2