1970

6.1

1971

6.4

1972

6.2

1973

5.7

1966

7.1

1999

6.8

1956

6.5

2004

7.0

2002

6.7

1987

3.2

2002

6.6

2004

6.4

2005

6.7

1968

6.9

1965

4.6

2000

7.3

2000

6.8

2004

6.5

2004

6.1

2003

6.2