In Japan,A consumption tax was introduced from 1st April 1989.
A consumption tax is 3 percents from 1st April 1989.
5 percents from 1st April 1997.
8 percents from 1st April 2014.
10 percents from 1st October 2019.
From 1st April 1989, the commodity tax was abolished.
In fact,price of CD was reduced about 6 percents.(includes consumption tax)
For example
If price of CD is 2000yen on 31st March 1989.
Next day,price of this CD becomes 1820yen (exclude consumption tax).
Even if add consumption tax,price is 1875yen.
To Beggars Road.
I'd like to explain concerning release date.
But some explanations are difficult to write in English for me.
So I divide it into several times and explain it.
According to RIAJ's RIS204,Y with circle means 'YOGAKU(洋楽)'.
'YOGAKU' is non-Japanese music.
To be exact,if foreign companies or person own a master,these musical pieces are called 'YOGAKU'.
L with circle means 'LOCAL(邦楽)'.
'LOCAL' is Japanese music.
X with circle means 'The rental use is prohibited'.
If it is written as 'X~2017.7.22',this means 'The rental use is prohibited until 22nd July 2017'.
If two dates are written in rectangular area,date of first part is Release Date.
If second part is written as (2017.7.22),this date means 'Release date of first issue (in the world)'
If second part is written as Japanese KANJI '再' (with circle) 2017.7.22,this means 'This CD ought to be sold in suggested price until 22nd July 2017'.
In OBI of this CD,add two Japanese HIRAGANA 'ま(ma)' and 'で(de)' followed by the second date.
'ma-de(まで)' means 'till' or 'until' in this case.
In Japan,media of audio software (Vinyl,CD,Cassette,etc) ought to be sold in suggested prices from 1953.(This means that discount of CD is prohibited by a law.)
This system (再販制度) is probably in English 'resale price maintenance system'.
From 1992,this system became valid in the period of two years only applied to audio software.
After that,many record companies shortened six months from two years.