But books were translated from 91 languages over the period studied, from Afrikaans to Yiddish.
In the period studied, the credit card debt of the average family increased by 53percentt.
During the period studied, this market-timing portfolio, after transaction costs, gained 11.5percentt, annualized.
And their numbers increased over the period studied as a whole.
Male participation in marathons grew 21.61% in the period studied, while women's participation increased by 33.35%.
Eight Chilean miners were killed over the period studied, at mines operated by Xstrata and Antofagasta.
The audit reviewed 14 buildings that had at least three hazardous violations still open during the time period studied.
Emergency visits for playground accidents declined to 98,000 from 187,000 a year over the period studied, they said.
Behind the collapse in first-time buyers is the extraordinary rise in house prices in the period studied.
Over the period studied, the researchers counted injuries in almost 150,000 people ages 2 months to 96 years.
That represents a rate of 3.7 deaths from mental health-related causes per 100,000 maternities during the period studied.
