1996

2.0

2004

5.5

2001

5.1

2009

7.5

1993

7.8

2002

5.6

1989

3.1

1970

2.0

2012

4.4

1975

5.5

1988

7.1

1976

5.7

2019

6.9

1989

5.0

2006

7.4

2003

7.8

1968

7.6

2009

6.5

2005

6.4

1972

5.7