In
1984, global internet traffic was 15 gigabytes per month. Internet
traffic surpassed the exabyte threshold in 2001, and the zettabyte
threshold in 2017.
Human Development Index ( HDI ) 2021 measures the average achievement in three basic dimensions of human development—a long and healthy life, knowledge and a decent standard of living. The health dimension is assessed by life expectancy at birth. The education dimension is measured by the mean of years of schooling for adults aged 25 years and more, along with expected years of schooling for children of school entering age. The standard of living dimension is measured by gross national income per capita. The pandemic dealt a serious blow to human development worldwide. In the 2021 index, 90% of countries saw their HDI value drop. Only a third of very high HDI countries saw a decline in 2021 (compared with over 90% in 2020), whereas HDI scores of 60% of low, medium and high HDI countries declined.
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