1991

7.0

2019

6.7

1992

4.5

1998

6.0

1987

6.3

1984

7.2

2001

7.5

1959

6.1

2006

7.0

2014

5.8

2000

6.7

2005

4.6

1980

5.9

2004

6.4

1963

6.9

2010

7.4

2010

7.4

2003

7.2

2005

5.2

1987

5.2