According to this site [0], there actually has been a dip. Here's an excerpt, draw your own conclusions:
"Essentially, with access to a more granular data set than had been publicly available, the economists could see that growth in manufacturing over the decades was almost entirely a result of statistical adjustments for improvement in semiconductor performance."
The world produces and consumes vastly more than it did at other points in that period and as a percentage Im guessing the percentage of what we produce to what we consume (ie our self reliance and share of the global production pie) has been steadily decreasing.
Id be interested to see numbers which prove or disprove this.
