1985

5.9

2011

7.1

2000

7.8

1964

8.1

2006

6.4

1990

7.0

2020

6.9

1980

6.9

2009

6.2

1978

6.6

1993

6.2

2013

6.5

1973

7.3

2004

6.9

1982

6.1

2014

6.3

2021

7.4

1935

7.4

1990

7.5

2002

5.9