2005

6.7

1960

7.5

1990

7.5

2006

7.2

1997

7.6

1981

6.8

1993

6.7

1985

8.1

2001

6.4

2005

5.0

2019

8.0

1986

6.5

1970

4.9

1997

5.7

1953

7.4

2000

5.8

2014

5.9

1996

6.8

2002

5.5

1992

5.4