1992

7.1

1999

7.6

1994

6.5

1984

7.3

2002

5.2

1974

5.7

2010

6.5

1961

7.7

1966

7.5

2000

7.0

1995

6.9

2007

6.4

2003

5.0

2015

7.2

2010

4.5

2005

5.8

2019

7.7

2003

6.9

2020

5.7