1994

7.4

1990

5.9

2010

7.2

1972

6.4

1995

4.6

1990

6.6

2007

6.1

1994

4.5

2011

6.6

1958

7.3

2018

6.2

2006

5.8

2020

7.0

1964

7.1

1988

5.5

2008

6.4

2006

6.0

2015

6.2

2012

7.1

2015

6.6