Answer:
I assume you put in the wrong subject this seems more of a economics question than anything but attendance at live performances have most likely decreased with the advancement of technology due to The ability to live stream performances for free
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If you want to incorporate 'for a year", you would need to say 'I have been in Poland for a year.'
But as 'been to' suggests just a visit and not a long stay, you may want to use "I had gone to Poland a year ago.'
