Some long time ago I read a statistic that on average more than 70 singles a week,
were released.
Most of 'em lost to oblivion until serious specialist nostalgia CD boxsets
were marketed to us music obsessives...

My memory of the exact number is a bit hazy now,
"70" will do for my immediate purpose,
unless a top mudcat musicology expert contradicts me;
but it accounts for how us 1970s teenagers were only aware of the tip of the colossal 1960s UK music iceberg...