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At the start of the 20th century, average life expectancy at birth was 49.2 years.
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At the beginning of the 1910s, average life expectancy at birth was 51.5 years.
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In the aftermath of the devastating effects of World War One and the Spanish Inflenza, it is estimated that global average life expectancy dropped by up to 10 years.
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At the beginning of the 1920s, average life expectancy at birth was 56.4.
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On September 3rd 1928, Professor Alexander Flemming accidently discovered antibiotics. This heavily impacted the increase of life expectancy.
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At the beginning of the 1930s, average life expectancy at birth was 59.2.
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At the beginning of the 1940s, average life expectancy at birth was 63.6.
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At the beginning of the 1950s, average life expectancy at birth was 68.1.
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At the beginning of the 1960s, average life expectancy at birth was 69.9.
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From 1960-1970 schools around the world started making mandatory vaccinations.
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At the beginning of the 1970s, average life expectancy at birth was 70.8.
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After claiming 300-500 million lives, smallpox was the first disease to be wiped out by human efforts. this was because of the smallpox vaccine discovered by Edward Jenner
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At the beginning of the 1980s, average life expectancy at birth was 73.9.
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At the beginning of the 1990s, average life expectancy at birth was 75.4.
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At the beginning of the 2000s, average life expectancy at birth was 78.1.
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At the beginning of ththis year, average life expectancy at birth was 80.3.