1968

6.9

2008

6.1

1977

7.0

2001

6.3

1971

7.4

2000

7.2

2019

5.8

2004

4.7

2021

6.8

2005

7.1

2005

5.2

2002

4.5

2004

6.6

1982

5.4

2009

6.7

1984

7.0

2009

6.5

2014

6.1

1959

6.9

1979

6.8